2821783268778 has 16 divisors (see below), whose sum is σ = 5644040571360. Its totient is φ = 940515417296.

The previous prime is 2821783268749. The next prime is 2821783268839. The reversal of 2821783268778 is 8778623871282.

It is a super-2 number, since 2×2821783268778² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19674000 + ... + 19816907.

It is an arithmetic number, because the mean of its divisors is an integer number (352752535710).

Almost surely, 2^{2821783268778} is an apocalyptic number.

2821783268778 is an abundant number, since it is smaller than the sum of its proper divisors (2822257302582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2821783268778 is a wasteful number, since it uses less digits than its factorization.

2821783268778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39502821.

The product of its digits is 202309632, while the sum is 69.

The spelling of 2821783268778 in words is "two trillion, eight hundred twenty-one billion, seven hundred eighty-three million, two hundred sixty-eight thousand, seven hundred seventy-eight".